Carbureter for internal-combustion engines.



A. H. R. FEDDEN.

CARBURETER FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED MAR. 28. I917.

Patented 001;. 29, 1918..

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.CARBURETER FOIR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED MAR-28. 19H.

1,283,126 I Patented Oct. 29, I918. k ZSHEETS-SHEET 2.

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ALFRED HUBERT lEtOY FEDDEN, or BRISTOL, ENGLAND, AssIe-Noa OI ONE-HALF TBRAZIL, sTaAKEn & co. LIMITED, or BRISTOL, ENGLAND. 4

Specification of Letters Patent.

Patented @ct. 29, Idle.

Application filed March 28, 1917. Serial NO. 157,948.

To all whom it may concern."

Be it known that I, ALBERT HUBERT ROY FEDDEN, a subject of the King ofGreat Britain and Ireland, of Motor Works, Flshponds, Bristol,Gloucestershire, England, have invented certain new and usefulImprovements in or relating to Carbureters for Internal-CombustionEngines, of which the following is a specification.

This invention relates tocarbureters for internal combustion engines.

A carbureter made in accordance with this I invention comprises a fuelchamber having a fuel inlet or jet as its base, a valve rod providedwith a needle valve at its lower end ada ted to coact with the said fuelinlet, means or adjusting the position of the needle with respect to thesaid fuel inlet permanently for normal conditions and temporarily duringthe running of the engine, a duct from said chamber to the choke tubebelow the throttle valve in the induction pipe, the upper end of theductbeing above the level of the fuel 1n the float chamber, a secondduct from said fuel chamber't'o the induction pipe above the throttlevalve, and means for admitting air to the said fuel chamber through thevalve rod.

In the drawings s Figure 1 is a side elevation of one form of fuelsupply. In the float chamber is disposed the float h, balance weight j,and needle valve 70 adapted to operate in the well known manner.Centrally disposed of the float chamber is a fuel chamber m having afuel inlet a. From this fuel chamber m is a duct leading to the choketube 0 below the throttle, and a duct leading to the induction pipeabove the t rottle. In the fuel chamberm is disposed a valve rod 9having a needle r-adapted to coact with the fuel inlet n; On the top ofthe float chamber f is disposed a part 8 having a helical surface whichis adapted to coact with the part v having a hehcoidal surface. Sweatedinto the part 8 is a tube t which surrounds the rod 9 with an air-tightfit. The part a turnson the tube t. The threaded sleeve 11 is providedwith a jet control lever to. On the sleeve 2) is a stop it which isadapted to engage with a stop 3/ on the top of the float chamber. Anadjusting nut 2 provided with a knurled edge engages the screwed sleevea. The valve rod 9 is provided with a head 3 having a flange 4 whichrests on the adjusting nut 2 and is held in position by a spring 5provided with a knob 6. The adjusting nut is held against rotation by aspring pressed ball 7 located in the control lever w. The valve rod 9 ishollow and is provided with air inlets 8 and air holes 9, 9 at differentheights leading to the fuel chamber m. The duct p is provided with anadjustable slow running nozzle 10 (Fig. 5) which projects into thechamber m, and is provided with holes 11, lland a knurled head 12 whichis held against rotation by a spring pressed ball 13.

The permanent adjustment of the valve needle 9" is made by rotating theknurled head 2 in relation to the control lever w and locking them inthat position so that when the stop a: in the sleeve engages the stop 3the needle .7 is at its predetermined normal position in respect to theinlet or jet n.

The temporary adjustment for restricting the flow of fuel to the chamberm and which is especially adapted for use with aircraft and in carswhere changesin altitude are experienced is effected by moving the jetcontrol lever '11), which is held by a suitable spring 14 in its normalor raised position, so that it rides down upon the inclined plane 8whereby the needle 1" enters the jet n and restricts the flow of fuel.

With a carbureter made in accordance .with the invention the valverodcan be removed without disturbing the permanent adjustment of theneedle valve and without breaking any fuel connections, and further theslow running nozzle is likewise adapted fuel through to be removedwithout breakingl any fuel connection or dismantling any ot r part ofthe carbureter.

The temporary adjustment can be operated by a Bowden wire mechanism orother suitable means by the pilot or driver and is altogetherindependent of the throttle.

With a carbureter having a fuel chamber centrally disposed of the floatchamber the pressure due to head tending to force the the jet n remainspractically constant irrespective of the angle of the carbureter.

What I claim and desire to secure by Letters Patent is 1. In acarbureter for internalcombustion engines, the combination of aninduction pipe, a choke tube and throttle valve disposed in said pipe, afloat chamber, means for supplying liquid fuel to said float chamber andmaintaining the fuel at a constant level, a fuel chamber disposedconcentrically with said float chamber, a fuel inlet or jet at the baseof said fuel chamber communicating'with said float chamber, a hollowvalve rod provided with a needle at its lower end adapted to coact withsaid fuel inlet or jet at the base of said fuel chamber, means foradjusting the position of the needle with respect to said fuel inletpermanently for normal conditigans and temporarily during the running 0the engine, a duct from said fuel chamber to the said choke tube belowthe throttle valve, a second duct from said fuel chamber to theinduction pipe above the throttle, and means for admitting air to thesaid fuel chamber through the said valve rod.

2. In a carbureter for internal combustion engines, the combination ofan induction pipe, a choke tube and throttle valve disposed in saidpipe, a float chamber, means for supplying liquid fuel to said floatchamber and maintaining the fuel at a constant level, a fuel chamberdisposed concentrically with said float chamber, a fuel inlet orjet atthe base of said fuel chamber communicating with said float chamber, ahollow valve rod provided with a needle at its lower end adapted tocoact with said fuel inlet or jet at the base of said fuel chamber,adjusting the position of the needle with respect to said fuel inletpermanently for nor.- mal conditions and temporarily during the runningof the engine, a duct from said fuel chamber to the said choke tubebelow the throttle valve, a second duct from said fuel chamber to theinduction pipe above the throttle, means for admitting air to the saidfuel chamber through the said valve rod and means for removing saidvalve rod without disturbing the permanent adjustment of the needlevalve.

In witness whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses.

ALFRED HUBERT ROY FEDDEN.

Witnesses:

' E. R; HoLLER,

E. TYLER.

means for,

